Development of a standardized screening method for detection of vancomycin-resistant enterococci
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Published in | Journal of Clinical Microbiology Vol. 32; no. 7; pp. 1700 - 1704 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
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Washington, DC
American Society for Microbiology
01.07.1994
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AbstractList | The incidence of vancomycin resistance among enterococci is increasing in the United States and elsewhere in the world, but automated susceptibility testing methods have difficulty detecting resistance expressed by certain strains. The agar screening method described by Willey et al. (B. M. Willey, B. N. Kreiswirth, A. E. Simor, G. Williams, S. R. Scriver, A. Phillips, and D. E. Low, J. Clin. Microbiol. 30:1621-1624, 1992) has been proposed as a reliable method for confirming vancomycin resistance. In this study, we investigated various parameters associated with the agar screening method and, on the basis of the findings, established optimum testing conditions for the method. First, to evaluate media and vancomycin concentrations, one laboratory used Mueller-Hinton and brain heart infusion agars supplemented with 4, 6, and 8 micrograms of vancomycin per ml to test 100 genetically characterized enterococcal strains. On the basis of the results obtained, brain heart infusion agar supplemented with 6 micrograms of vancomycin per ml was selected for further study. Subsequently, eight laboratories used the medium to test both reference and clinical isolates. There was very good performance with the reference strains and, among 158 clinical isolates tested, the method demonstrated sensitivity and specificity of 100% and from 96 to 99%, respectively. The incidence of vancomycin resistance among enterococci is increasing in the United States and elsewhere in the world, but automated susceptibility testing methods have difficulty detecting resistance expressed by certain strains. The agar screening method described by Willey et al. has been proposed as a reliable method for confirming vancomycin resistance. In this study, we investigated various parameters associated with the agar screening method and, on the basis of the findings, established optimum testing conditions for the method. First, to evaluate media and vancomycin concentrations, one laboratory used Mueller-Hinton and brain heart infusion agars supplemented with 4,6, and 8 mu g of vancomycin per ml to test 100 genetically characterized enterococcal strains. On the basis of the results obtained, brain heart infusion agar supplemented with 6 mu g of vancomycin per ml was selected for further study. Subsequently, eight laboratories used the medium to test both reference and clinical isolates. There was very good performance with the reference strains and, among 158 clinical isolates tested, the method demonstrated sensitivity and specificity of 100% and from 96 to 99%, respectively. Article Usage Stats Services JCM Citing Articles Google Scholar PubMed Related Content Social Bookmarking CiteULike Delicious Digg Facebook Google+ Mendeley Reddit StumbleUpon Twitter current issue JCM About JCM Subscribers Authors Reviewers Advertisers Inquiries from the Press Permissions & Commercial Reprints ASM Journals Public Access Policy JCM RSS Feeds 1752 N Street N.W. • Washington DC 20036 202.737.3600 • 202.942.9355 fax • journals@asmusa.org Print ISSN: 0095-1137 Online ISSN: 1098-660X Copyright © 2014 by the American Society for Microbiology. For an alternate route to JCM .asm.org, visit: JCM |
Author | J M Swenson R J Zabransky F C Tenover M P Weinstein M J Ferraro G Doern N C Clark D F Sahm L B Reller M A Pfaller |
AuthorAffiliation | Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia 30333 |
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Keywords | Enterococcus Culture medium Composition Drug susceptibility test Multicenter study Standardization Method Resistance Streptococcaceae Antibiotic Bacteria Micrococcales Detection Comparative study |
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Mendeley... The incidence of vancomycin resistance among enterococci is increasing in the United States and elsewhere in the world, but automated susceptibility testing... |
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SubjectTerms | Antibacterial agents Antibiotics. Antiinfectious agents. Antiparasitic agents Biological and medical sciences Culture Media - chemistry Drug Resistance, Microbial Enterococcus Enterococcus - drug effects Enterococcus - isolation & purification Medical sciences Microbial Sensitivity Tests - methods Pharmacology. Drug treatments Sensitivity and Specificity Species Specificity Vancomycin - pharmacology |
Title | Development of a standardized screening method for detection of vancomycin-resistant enterococci |
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